DE2535344A1 - CIRCUIT ARRANGEMENT FOR SOUND GENERATION - Google Patents

Description

O C * 3 C O / /

PATKXTANWALTE DR. IXO. ERXST SOMMERFELD

DR. DIETER v. BIJZOM) DIPL ·. ING. PKTER SCHLTZ DIPPING. WOLFGANG HEUSLER

D-8 MUEXCHKN 80

MAniA-THEHESIA-STIlASSE 22 POST BOX 800008

TELEPHONE "OSn / 47 (! 0Oe 470S19

ΤΕΙ.ΠΧ 322038 TELEGRAM SOMBEZ

July 28, 1975 9701-75 Dr.v.B / ö

Ci-IB
Colonia Management and Consulting Company iabH. & Co.KG ·.

5000 Cologne 41, Schumannstr. 22nd

Circuit arrangement for sound generation

Addition to P 2 515 524.2

In the DT-CS 2 515 524 there is already an electronic 31asinstrui: '. Ent has been proposed, nit deiu special Woodwind instruments excellent ii; iitie3? En let. i-iit den However, the IlaBnahrien specified there can be d: ".e sounds gev / ioser Instructor groups, especially the brass, still do not replicate fully lioriiiien.

This problem is v / ird by the in claim 1 below Protection posed invention solved.

j) The creation of a gap coupling makes it possible, e.g. Tro2.rpctonklänge and the, sounds of other Bj.echblasinstructions to recreate very naturally. It goes without saying that the Urfindrmg not on the formation of the sounds of bloody blur -

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limited to instruments, they can be purely for production synthetic sounds in electronic imsik and also are used to simulate other types of instruments.

In the following a circuit arrangement and special-Ie new blow vans according to the invention with reference to the Drawing explained in more detail; show it:

Pig. 1 shows a circuit arrangement according to an exemplary embodiment of the invention;

Pig. 2 shows an embodiment of a filter circuit for the circuit arrangement according to Pig. 1 y

Pig. 3 and 4 examples of examples of two! Ol & sv-andler who It is advantageous to have an electronic risk management instruction a circuit 2C2: ic! i3 Pig. 1 or other electronic let use musical instruments in which gev; iüse PiTiiktionen be controlled by an air flow.

ο ■

In Pig. 1 shown circuit arrangement can be part of an electronic 'musical instrument act as it is in the disclosure policy mentioned at the beginning is described. In the example according to Pig. 1 contains the circuit arrangement includes an audio frequency generator 10, dor 2.B. provides a square wave output signal. Lie the repetition frequency of the square-wave pulses in the output signal of the lOnfrequenzgenerator 10 so / ie the duty cycle of the pulse ο can be controlled, for example, by a control device 12, the lianual containing a sequential key and a register control en.tha.lten can. The output signal of the audio frequency generator 10 V7 is fed to a signal input 14 of a first amplifier circuit 16 which, at a signal output 18, has an amplified Output signal supplies. The gain factor zv / isclieii signal input 14 "and signal output 18 can be controlled by a control signal (" control voltage ") that is sent to a gain control input 20 of the amplifier circuit 16 is supplied. The amplifier circuit 16 "can in the usual way by a negative feedback

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circuit 22 be stabilized. The signal output 18 of the first amplifier circuit 16 is connected to the signal input second amplifier circuit 24, the output of which is connected to an output 28 via a filter circuit 26 to which e.g. a power amplifier and a loudspeaker can be connected.

According to the invention, the signal output 18 is controllable first amplifier circuit 16 via a feedback circuit 30 coupled to the gain control input 20. In the illustrated embodiment according to Pig. 1 contains the feedback circuit 30 is the second amplifier circuit 24, the filter circuit 26, a phase shift circuit 32, a second filter circuit 34 and an output resistor 36. The feedback circuit can of course also c. be designed differently and neither needs the second amplifier circuit 24 still the filter circuit 26 closed.

The gain control input 20 is also via a second variable resistor 38 with a gain control signal source 40 connected, which is apparently represented by a potentiometer 42 and a bias source V.

The circuit arrangement according to FIG. 1 also contains a capacitor 44 connected between the signal output 18 of the first amplifier circuit 16 and I-Iasse is connected.

Whenever the circuit arrangement according to FIG. 1 is intended to be used, for example, to simulate trumpet sounds, the filter circuit 26 can, for example, have the structure shown in FIG. In parallel, it contains a first low-pass filter 46, the pass band can roughly coincide with the basic tone range of the instrument to be simulated, and three band-pass filters 48, 50, 52, which act as formant filters. The parallel circuit 46-43-50-52 can be followed by a second low-pass filter 54, particularly in the case of devices for simulating dull-sounding instruments.

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In the circuit arrangement according to FIG. 1, the second amplifier circuit 24 is designed so that it starts from a certain Input signal amplitude that is within the output signal amplitude range the first amplifier circuit 18 is limited.

The circuit arrangement described works as follows: If the feedback circuit 30 is left off for the time being disregarding this, the pulses from the output of the audio frequency generator are grounded 10 first amplified by the first amplifier circuit 16 by a factor which depends on the magnitude of the gain control signal at the gain control input 20. the Leading and trailing edges are used as an integration link The effective capacitance 44 is slightly rounded and the pulses thus deformed are then passed through the second amplifier circuit 24 v / pus reinforced. At a relatively low gain of the In the first amplifier circuit 16, the pulses at the output of the second amplifier circuit 24 have approximately that shown at 56a Forn. If the gain is a little higher, the impulses decrease the shape shown at 56b, the planks have become steeper, and a certain limitation has already taken place. With an even higher gain (pulse 56c), the pulse shape is even closer to that of a square pulse.

The filter circuit 26 now selects the Ponvanten ranges typical for the instrument to be simulated ^{from the pulses l} jo.

In the circuit arrangement according to the invention, the (more or less strongly modified) audio frequency signal is effective back to the gain of the first amplifier circuit 16, since the output of the filter circuit 26 via a feedback branch is coupled to the gain control input 20. The audio frequency signal can be in this feedback branch modified v / ground, e.g. by the phase shift circuit 32 and / or the second filter circuit 34, clie a high-pass, Can be low-pass, band-pass or, in particular, a notch filter (band-stop filter). The degree of feedback that is partial

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be an i-'itkopru.ung and partly a negative coupling v / i?: d, You can be set by the control resistor 36.

It has been shown that; 3 special sound effects can be achieved through the applied I-feedback and, in particular, the sounds of bleached-in-the-bleeding constructions are very lifelike; permit. Veiv.iutl. I have this si.kie cause d ^ri .rin, de.3 also with real wind instruments ei ^ ie. Rücln-zirlzimg dor scliv.'in ^ er.iieii LujTtsäule on the Sclr.vin ^ migEgenerator (lips, ilohrblatt usvi. ) stcttü j.nc.et.

; 3ei der vorliese? ^ Den Scjialtun ^ sanordrniii ^; the feedback is dependent on j '^ iplitudeAisteuersiyisl, whose iiiiiplitude is primarily determined by d;'. e Verotl'i'ki ^ ijjiDsteusrsi ^ ialnuellc AC bestii2 :: it ^ 7, and it has a veri'iidciclicken prccuenn- vizö. no: .S3ii £ ohalt. Dia feedback. cattle can be modified by the behavior of the circuit elements contained in the feedback.

The Pig. 3 and 4 show two new, advantageous blowers which can be used to generate the gain control signal. The IQlasv / andler according to Pig. 3 contains a blower duct widened to form a Kanner 60, through which the airflow generated by the player flows when playing. kin part of the 'vend of the Kanner is formed by an elastic kenbrane 52, eg CU3 GrUi: -ni, which carries a thin metallic layer ο · 1-. A counter electrode 66 in Pom, for example a metal plate, is located at a close distance from the central layer 64. The metal layer 64 forms a capacitor with the counter electrode 66, the capacitance of which depends on the air pressure in the caliper 60, since the membrane 62 approaches the counter electrode 65 more or less according to the air pressure. The gain control signcJ. can be generated in a known range depending on the capacity.

BAD ORIGINAL ORIGINAL INSPECTED

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The blow converter according to IMg. 4 contains a whistle 70 that is blown by the player. The pipe plumb with a liikrophone. 72 coupled. The signal generated by the i-microphone 72 is used here only to obtain a Junplitudeninformatioii, not However, a prouence information. Me asplitudeniiiforziation It can then be used as the gain control signal. Of the The sound of the whistle can be made so quiet or placed in such a frequency range that it does not interfere.

It should also be emphasized that the. ". '! uekkoppliinj vor.i Ä.U3gfiig 18 dec amplifier 16 on don Yernt ^ rku-i. ^ G ^ teuerei:': -, ^ rng 20: iic-: t in addition di "nt, the middle Jaicg £ n _o sc:" - gr.i ".."" ^: -V) 2ge"L> onstc.jit zv. lirlton, but Cvzv., den Olic.raizter rlos £ ig: iales to change, which stands at the exit Lclairje 23 sur Vci-fUgviig, "ei ucr".L-ickkopplun;: hand-slt so it is not, v: io at ci.n ^ r "/Gi-ntc.rlaLiigüjrc-gclV '.ng, \ va the Crsger ^ ^ ο OppliiVL ir · he Sp :: njz. ^ or iJtrones that filtered through a low pass filter \ o :: <\ ~ he is and contain virtually no Sirnalfrenuensen aeiir. With the present feedback, on the other hand, signal frequencies are also fed back and the feedback can act as positive feedback or negative feedback for the various frequency air lines. Thus, there is also a simultaneous coupling and coupling at the same time.

BATH ORIGINAL

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Claims (8)

η _ Claims Circuit arrangement for generating sound with a sound signal source and a controllable amplifier circuit which has a signal input coupled to the sound signal source, a signal output and a gain control input . according to patent application P) 2 515 524 to control their gain, / d a α u r c Ii .gekennze i c h η e t that the signal output (18) the amplifier circuit (16) by a feedback circuit (50) is coupled to the gain control input (20). 2. Circuit arrangement according to claim 1, characterized g e k e η indicates that the feedback circuit contains a rotating link (52). 3. Circuit arrangement according to claim 1 or 2, characterized in that the feedback circuit contains a filter section (34). 4. Circuit arrangement according to claim 3, characterized characterized in that the filter circuit includes a band elimination filter. 5. Shifting arrangement according to one of the previous claims, characterized in that at the output of the amplifier circuit (16) an integrating capacitance (44) uiid the output signal of the amplifier circuit limiting circuit arrangement (44) are connected. et "' ί * - 6. Circuit arrangement according to one of the preceding claims, d. ad u raw marked that the gain control input (20) also having a device is coupled to generate a volume control signal,! • / calibrate contains a Dlasluftv / andler. 709808/0497 - σ - 7. Set up after. Claim 6, characterized in that that the Blasluftvrandler one of the blown air flowed through Kai-iaer (60) l.-dfc an elastic one ! Edge part (62) contains which with an electrode (64) of a Capacitor (64-66) of variable capacitance mechanically connected that is to provide a device with the amplification control signal heard. 8. Circuit arrangement according to claim 6, characterized QQ Ic 'e η η ζ eich η et, that.3 the jjlacv / aiidler contains a whistle (YO) as well as an acoustically coupled I-Liqueurplion (72) and that the I-microphone with a circuit arrangement: ⁷ jur Gev .'irmimg the Aurolitudeninforncitiun from the Hilcrophone output signal is coupled. 709808/0497 ORIGINAL INSPECTED